Best antivirus for hp pavilion [Closed]

hi,
i just bought a new notebook hewlett packard pavilion, windows vista integrated,ram 1 giga incorporated and i would like to know about the appropriate anti virus for the safe of my notebook.what would be the safer protection?
thanks

I just got off of the phone with hp because my Compaq Presario needs to be fixed. They "claim" that Norton is the most compatible anti-virus for hp products. I've been using AVG with no issues. I know the issue with my laptop is not caused by the anti-virus.